MATERIALS
Close up of the built rotor
Improvements to this type can provide efficiency and sustainability benefits.
POWER, WEIGHT AND EFFICIENCY Asynchronous machines (ASM) are built up of two components: the outer, fixed stator and the inner, rotating rotor. Unlike permanent magnet synchronous motors, these machines do not require expensive rare earth materials. As a result, their use in automotive applications has been on the rise in recent years. The compact size of the ASM is another advantage over a synchronous motor. This makes it ideal for small, lightweight machines with little space for larger components. This is where simple math enters the picture: Getting more power out of less weight will result in a higher overall efficiency. The potential for further
development of this machine is particularly noteworthy. One way to increase circumferential speeds and, more importantly, efficiency is to use copper materials. Studies have shown that it is possible to increase the performance of ASM systems by a factor of 2 to 3. Using this knowledge, a redesigned
ADVANCING ASYNCHRONOUS MOTORS
In order to reduce power consumption and the resulting CO2 emissions, it is necessary to continue optimising known and established concepts. Gerhard Thumm shares how asynchronous motors can become more efficient and advanced.
G
overnment regulations require lower and lower levels of CO2 emissions in various areas. To meet
these requirements, the overall energy consumption needs to be continuously improved. This includes electric motors. Approximately 38% of
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the world’s electricity is consumed by electric motors in buildings and industrial applications. A common type of electric motor is the three-phase induction Motor.
short-circuit ring consisting of segmented end rings was developed by the Wieland Group.
STEP-BY-STEP SEGMENTED DESIGN The fact that the shading rings consist of multiple disks is the key feature of this design. These discs are pierced by the forming rods in a new configuration that allows the cage assemblies to be beam welded together. Welding bars and discs forms a closed cage, allowing for a flexible rotor design that can be tailored to
Copper has a 50% higher electrical coductivity compared to aluminium
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